The tourism sector has developed over the years as one of the main contributors to the nation’s socio-economy. However, tourism has also said to be the cause of the depletion of the natural environment especially the marine ecosystem due to the irresponsible behavior of tourists. There is a growing interest in understanding the impact of tourism towards the sustainability of a particular ecotourism destination, thus this study aims to examine the drivers of tourists’ intention to behave in an environmentally responsible manner specifically in marine parks. This study utilizes the responsible environmental behavior model with the addition of consumption values theory and destination image in hope to provide a more comprehensive explanation. A researcher-administered face-to-face survey was conducted among 103 tourists and analysed using partial least squares technique. The results empirically revealed that environmental knowledge and destination image significantly influenced the tourists’ intention to behave in an environmentally responsible manner. Thus, in fostering a more responsible behavior among tourists, more emphasis can be placed on enhancing their knowledge while capitalizing on the destination’s image.